Analysis and optimization of the performance of closed heat pump dryer based on zeotropic mixtures

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS
Hui Ni, Peng Hu, Yuchen Li
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引用次数: 0

Abstract

Compared with traditional electric heating dryers, heat pump dryers are more energy efficient and environmentally friendly. In this work, a novel heat pump dryer with zeotropic mixtures as working fluids and recuperators is studied and compared with the cycle using the corresponding pure working fluid. The effects of the evaporation temperature, and the components and mass fractions of the zeotropic mixtures on the performance of the system are investigated. After comprehensively considering various performance coefficients, this work selects a CO2/R290 (mass fraction of 20/80) mixture as the optimal working fluid of the heat pump dryer system. Compared with R134a, it significantly improves the coefficient of performance (COP), specific moisture extraction rate (SMER), volumetric heating capacity (VHC), and pressure ratio (PR), with maximum performance improvements of 33.66 %, 41.50 %, 181.44 %, and 46.55 %, respectively. The zeotropic mixture also has significant performance advantages in terms of less charge and exergy destruction. Moreover, the addition of CO2 as a nonflammable refrigerant to the components reduces the flammability of the working fluid compared with that of pure R290, which improves safety in practical applications.
基于各向同性混合物的封闭式热泵干燥器的性能分析与优化
与传统的电加热干燥器相比,热泵干燥器更加节能环保。在这项工作中,研究了一种使用各向同性混合物作为工作流体和换热器的新型热泵干燥器,并与使用相应纯工作流体的循环进行了比较。研究了蒸发温度、各向同性混合物的成分和质量分数对系统性能的影响。在综合考虑了各种性能系数后,本研究选择了 CO2/R290(质量分数为 20/80)混合物作为热泵干燥器系统的最佳工作流体。与 R134a 相比,它显著提高了性能系数 (COP)、比湿萃取率 (SMER)、容积加热能力 (VHC) 和压力比 (PR),最大性能改进分别为 33.66 %、41.50 %、181.44 % 和 46.55 %。各向同性混合物在减少充注和放能破坏方面也具有显著的性能优势。此外,与纯 R290 相比,在组件中添加二氧化碳这种不易燃制冷剂可降低工作流体的易燃性,从而提高实际应用的安全性。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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